Rhone-Poulenc Specialites Chimiques

Ciba-Geigy Corporation

Rhone-Poulenc Nutrition Animale

Rhone-Poulenc Chimie

Rhone-Poulenc Industries

Rhone-Poulenc Rorer S.a.

Other

Rhodia Chimie

Rhone-Poulenc Sante

Bluestar Silicones France Sas

Aventis Cropscience Gmbh

Christian Prud'Homme

Jean-Paul Michalon

Jacques Cavezzan

Michel Veillard

Pierre Ardaillon

Gerard Simon

Didier Bazile

Laurent Saint-Jalmes

Etienne Fleury

Michel Bargain

Sébastien Sterin

Hugues Porte

Philippe Michaud

Louis Giral

Ghislaine Torres

Catherine George

Michel Dury

Gilles Spenlehauer

Francois Schue

Robert Zerrouk

Jean-Francois Rostaing

Gilles Spenleuhauer

Jean Herz

Philippe Chaumont

Sylvianne Dumas

Thermally-stable silicone elastomers are prepared from organopolysiloxane compositions by polyaddition, polycondensation or vulcanization reactions in the presence of peroxide; the thermal stability of the silicone elastomers is achieved by the inclusion of an additive derived from an iron (III) complex.

Thermally-stable crosslinked silicone elastomers

The present invention relates to the use of a stabilising composition free of derivatives of 6-aminouracyl or 6-aminothiouracyl type, and comprising at least one &#x3b2;-diketone bearing two aromatic nuclei, at least one of which bears at least one substituent on one of the two orthopositions or on the paraposition; the said substituent being chosen from &#x2014;R, &#x2014;OR, &#x2014;SR, &#x2014;COOH, &#x2014;O&#x2014;CFand &#x2014;S&#x2014;CFradicals, in which formulae R is an alkyl radical. The invention also relates to halogenated polymers comprising such a stabilising composition.

Use of substituted biaromatic &#x3b2;-diketone as stabilizing agent of halogenated polymers and resulting polymer

The invention relates to an active substance vector multiparticulate system and to the production and use thereof. The object of the invention is an active-substance vector multiparticulate system comprising one or several active substances included in a hydrophilic organic matrix comprising at least one hydrosoluble and/or hydrodispersable anionic polymer which is insolubilized by a metallic cation. The invention can be specifically used in the food industry, detergents and agrochemistry.

Active-substance vector multiparticulate system, production and use thereof

Nanoparticles are prepared by dissolving a poly(ethylene oxide) and/or poly(propylene oxide) polylactic copolymer in an organic solvent followed by formation of nanoparticles by mixing the solution containing the polymer with an aqueous solution and by precipitation, without using an additional colloidal protective agent or by microfluidization and solvent evaporation. Nanoparticles prepared by this method are disclosed.

Process for preparing nanoparticles

The invention discloses nanoparticles offering an extended time before capture by the reticulo-endothelial system. Said particles are composed of an ethylene and/or propylene polyoxide polylactic copolymer optionally mixed with a polylactic polymer.

Nanoparticles based on a polyoxyethelene and polyactic acid block

A nutrient or medicinal composition for administration to ruminants, which comprises one or more biologically active substances coated with a composition comprising a chitosan salt and at least one fat.

Chitosan-based nutrient or medicinal compositions for administration to

A process for coating at least one medicinal and/or foodstuff active principle useful for ruminants. At least one monomer is polymerized in an oil-in-water emulsion in the presence of a surfactant to synthesize a pH-sensitive-polymer composition, the composition being obtained in an oil-in-water emulsion. Without isolation of the pH-sensitive polymer, the oil-in-water emulsion is used to coat the active principle, preferably methionine or lysine or a derivative thereof. The pH-sensitive polymer is not dissolved in an organic solvent(s) in either the polymerization or coating steps. The pH-sensitive polymer is stable at pH 6 but at pH 2, the coated active principle is released.

Process for coating active principles using a pH-sensitive polymer

A new method of coating an active principle which comprises the step of coating an active principle with an aqueous emulsion or dispersion containing one or more pH-sensitive polymers.

Method for coating active principles with a pH-sensitive polymer

Silicone dosage forms adapted for the continuous and controlled release of iodine values, notably to domestic water supplies for the treatment of the various disease states attributed to iodine deficiency, are heat-shaped from (A) a thermoplastic silicone copolymer, and (B) a therapeutically effective amount of at least one water soluble, nontoxic, organic and/or inorganic iodine compound which is in solid state at ambient temperature.

Thermoplastic silicone shaped articles for controlled release of iodine

Particles of active substance are encapsulated by spraying them with a thermoplastic silicone copolymer in solution in an organic solvent or in an aqueous dispersion or emulsion and removing the solvent or water by drying with hot air. The spraying/drying process employed is, for example, the Wurster process. The copolymer employed can be made up of a succession of polydiorganosiloxane segments or blocks and of organic segments or blocks (polyesters, polyethers, polyurethanes, polystyrenes, and the like). It can also be a polydiorganosiloxane grafted with organic chains. The active substance is in the form of particles with a particle size of between 50 .mu.m and 5 mm. It may be a catalyst, a perfume, a colorant, a cosmetic product, a medication, a plant-protection product, plant seeds, and the like. The invention is especially useful for controlling the release of active substance in an aqueous medium.

Process for encapsulating particles with a silicone

Thermally stable copolyimidoamides containing recurring diorganopolysiloxane structural units are improvedly prepared by directly interreacting, in a solvent medium:

Preparation of thermally stable copolyimidoamides containing

Substrates, e.g., silicon wafers, coated with a UV-curable organopolysiloxane composition including a crosslinking catalyst therefor (e.g., a platinum group metal compound) and an amount of a crosslinking inhibitor (e.g., an azodicarboxylate) which is effective at ambient temperature, but ineffective to prevent crosslinking on exposure of the composition to ultraviolet radiation, are well adapted for the imaging of negative intelligence patterns thereon.

UV-curable organopolysiloxane compositions and negative photoresists

The present invention relates to electrically conductive potentially adhesive compositions and to films formed from these compositions which are capable of being employed in particular for the adhesive bonding of the surfaces of electronic devices. These compositions are characterized in that they comprise a thermoplastic polyblock organopolysiloxane copolymer with elastomeric properties and particles whose surface at least is electrically conductive and, if appropriate, a solvent or diluent.

Electrically conductive, potentially adhesive composition

The present invention relates to electrically conductive, potentially adhesive compositions and to films formed from these compositions which are capable of being employed in particular for the adhesive bonding of the surfaces of electronic devices. These compositions are characterized in that they comprise a thermoplastic block copolymer containing polysiloxane and urethane groups, with elastomeric properties and particles whose surface at least is electrically conductive and, if appropriate, a solvent or diluent.

Dimethyldichlorosilane is selectively and efficiently prepared by reacting methyl chloride with a solid contact mass comprising silicon and a catalytically effective amount of copper or a copper compound, said copper catalyst comprising (i) from about 10 to 1000 ppm of tin, antimony, or admixture thereof, or of a tin or antimony compound, or admixture thereof, (ii) from about 0.01 to 2% by weight of at least one of the metallic additives beryllium, calcium and magnesium, or compound thereof, and, optionally, (iii) from about 0.01 to 3% by weight of zinc or a zinc compound.

Growing community of inventors

Lyons, France

Christian Prud'Homme